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Back out Bug 462463 for massively regressing pymake depend build spee…
…d. CLOSED TREE
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| #!/usr/bin/env perl | ||
|
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| # This Source Code Form is subject to the terms of the Mozilla Public | ||
| # License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| # file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
|
|
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| # mddepend.pl - Reads in dependencies generated my -MD flag. Prints list | ||
| # of objects that need to be rebuilt. These can then be added to the | ||
| # PHONY target. Using this script copes with the problem of header | ||
| # files that have been removed from the build. | ||
| # | ||
| # Usage: | ||
| # mddepend.pl <output_file> <dependency_files...> | ||
| # | ||
| # Send comments, improvements, bugs to Steve Lamm (slamm@netscape.com). | ||
|
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| use strict; | ||
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| use constant DEBUG => 0; | ||
|
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| my $outfile = shift @ARGV; | ||
| my $silent = $ENV{MAKEFLAGS} =~ /^\w*s|\s-s/; | ||
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| my $line = ''; | ||
| my %alldeps; | ||
| # Parse dependency files | ||
| while (<>) { | ||
| s/\r?\n$//; # Handle both unix and DOS line endings | ||
| $line .= $_; | ||
| if ($line =~ /\\$/) { | ||
| chop $line; | ||
| next; | ||
| } | ||
|
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| $line =~ s|\\|/|g; | ||
|
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| my ($obj,$rest) = split /\s*:\s+/, $line, 2; | ||
| $line = ''; | ||
| next if !$obj || !$rest; | ||
|
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| my @deps = split /\s+/, $rest; | ||
| push @{$alldeps{$obj}}, @deps; | ||
| if (DEBUG >= 2) { | ||
| foreach my $dep (@deps) { print STDERR "add $obj $dep\n"; } | ||
| } | ||
| } | ||
|
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| # Test dependencies | ||
| my %modtimes; # cache | ||
| my @objs; # force rebuild on these | ||
| OBJ_LOOP: foreach my $obj (keys %alldeps) { | ||
| my $mtime = (stat $obj)[9] or next; | ||
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| my %not_in_cache; | ||
| my $deps = $alldeps{$obj}; | ||
| foreach my $dep_file (@{$deps}) { | ||
| my $dep_mtime = $modtimes{$dep_file}; | ||
| if (not defined $dep_mtime) { | ||
| print STDERR "Skipping $dep_file for $obj, will stat() later\n" if DEBUG >= 2; | ||
| $not_in_cache{$dep_file} = 1; | ||
| next; | ||
| } | ||
|
|
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| print STDERR "Found $dep_file in cache\n" if DEBUG >= 2; | ||
|
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| if ($dep_mtime > $mtime) { | ||
| print STDERR "$dep_file($dep_mtime) newer than $obj($mtime)\n" if DEBUG; | ||
| } | ||
| elsif ($dep_mtime == -1) { | ||
| print STDERR "Couldn't stat $dep_file for $obj\n" if DEBUG; | ||
| } | ||
| else { | ||
| print STDERR "$dep_file($dep_mtime) older than $obj($mtime)\n" if DEBUG >= 2; | ||
| next; | ||
| } | ||
|
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| push @objs, $obj; # dependency is missing or newer | ||
| next OBJ_LOOP; # skip checking the rest of the dependencies | ||
| } | ||
|
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| foreach my $dep_file (keys %not_in_cache) { | ||
| print STDERR "STAT $dep_file for $obj\n" if DEBUG >= 2; | ||
| my $dep_mtime = $modtimes{$dep_file} = (stat $dep_file)[9] || -1; | ||
|
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| if ($dep_mtime > $mtime) { | ||
| print STDERR "$dep_file($dep_mtime) newer than $obj($mtime)\n" if DEBUG; | ||
| } | ||
| elsif ($dep_mtime == -1) { | ||
| print STDERR "Couldn't stat $dep_file for $obj\n" if DEBUG; | ||
| } | ||
| else { | ||
| print STDERR "$dep_file($dep_mtime) older than $obj($mtime)\n" if DEBUG >= 2; | ||
| next; | ||
| } | ||
|
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| push @objs, $obj; # dependency is missing or newer | ||
| next OBJ_LOOP; # skip checking the rest of the dependencies | ||
| } | ||
|
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| # If we get here it means nothing needs to be done for $obj | ||
| } | ||
|
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| # Output objects to rebuild (if needed). | ||
| if ($outfile eq '-') { | ||
| if (@objs) { | ||
| print "@objs: FORCE\n"; | ||
| } | ||
| } elsif (@objs) { | ||
| my $old_output; | ||
| my $new_output = "@objs: FORCE\n"; | ||
|
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| # Read in the current dependencies file. | ||
| open(OLD, "<$outfile") | ||
| and $old_output = <OLD>; | ||
| close(OLD); | ||
|
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| # Only write out the dependencies if they are different. | ||
| if ($new_output ne $old_output) { | ||
| open(OUT, ">$outfile") and print OUT "$new_output"; | ||
| print "Updating dependencies file, $outfile\n" unless $silent; | ||
| if (DEBUG) { | ||
| print "new: $new_output\n"; | ||
| print "was: $old_output\n" if $old_output ne ''; | ||
| } | ||
| } | ||
| } elsif (-s $outfile) { | ||
| # Remove the old dependencies because all objects are up to date. | ||
| print "Removing old dependencies file, $outfile\n" unless $silent; | ||
|
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| if (DEBUG) { | ||
| my $old_output; | ||
| open(OLD, "<$outfile") | ||
| and $old_output = <OLD>; | ||
| close(OLD); | ||
| print "was: $old_output\n"; | ||
| } | ||
|
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| unlink $outfile; | ||
| } |
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